Coursey, J.
, Dragoset, R.
, Mohr, P.
, Olsen, K.
, Saloman, E.
, Sansonetti, A.
, Wiersma, G.
and Zucker, M.
(1999),
NIST Physics Laboratory WWW Page, physics.nist.gov, [online], http://physics.nist.gov
(Accessed December 6, 2024)